Thanks again, for your most recent comments….much appreciated! I will go ahead and implement your suggestions.
So, I just received the wireless card, stuck it in the pfSense box, and voila, it seems to get recognized pretty well. Other than assigning the interface to OPT2, I haven't done anything with it as yet (still have to figure out how to setup the pfSense box as a router).
Alongwith the wireless card I had also ordered a second "StarTech 1-Port 10/100/1000Mbps PCI Ethernet Card - Model #: ST1000BT32", which I also stuck into the pfSense box at the same time. Assigned OPT1 to this interface. The cost of each of these cards is approx. $15....so I've invested #30 for the 2 cards.
I know it's a cheaper option, but would it be wise to stick with these 2 cards (having spent just $30) versus purchasing a used HP 4-port card for $48 + tax + shipping (approx. $60) from eBay? In other words, would I ever need 5 gigabit ports (as opposed to just 3), and also bear in mind that these 2 single port cards are just PCI (not PCIe), whereas the used HP card is PCIe. Would that make a big difference, and therefore would make more sense for me to pay more and just buy the 4-port card?